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Post by David on Jun 7, 2021 12:54:04 GMT -6
Has anyone in the Utah County area noticed a reduction in the signal strength of KSL-AM lately? A listener in another Utah radio discussion group said it sounds like 1160 is operating at reduced power or from an auxiliary antenna site at his location in Utah County. I wonder if it has anything to do with the KSL-AM HD software issues of a couple of weeks ago.
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Post by kenglish on Jun 7, 2021 20:57:41 GMT -6
I wonder how his overall noise level is?
KSL-1160, like many high-power AM's, uses Modulation-Dependent Carrier Level (MDCL), which varies the main carrier level according to modulation.
If you are hitting 100% modulation, you need all 50 KW of the carrier. During quieter moments, you don't. Stations save a lot of money on their power bill, by keeping the average consumption down a bit.
The only downside is that, if you are listening from far away, or have a bit elevated noise floor, you'll hear that noise level pump up a bit during low-modulation passages. You wouldn't have noticed the noise if there was full carrier there. MDCL can suppress the carrier by as much as 6 dB, if there is no audio at all.
I got questioned about this by "World of Radio's" Glenn Houser. He noticed it in Oklahoma. Also noted by a retired KSL engineer in Price, and on a couple of EAS receivers locally.
The atmospheric noise will be higher in the warmer months. Add in noise from nighttime lighting fixtures, and it can be pretty noticeable.
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Post by kenglish on Jun 26, 2021 14:07:14 GMT -6
Someone else just asked this on another board.
I guess it might be time to go out and count the ground radials. It has happened before.
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